Many officials still privately believe Greece will fail to honour its commitments and that the country will need either a third bailout or will be allowed to default.
Pressure groups have expressed disappointment over the G8's failure to honour those previous commitments.
Lord Adonis said operators would be expected to honour their existing commitments on services "in full".
In his speech, the chancellor promised to honour past spending commitments and do more in the future.
European Commission spokesman Olivier Bailly said the EU expected Italy to "honour its commitments" on debt and deficit reduction, and other structural reform, saying he understood the "concern expressed by Italian citizens".
The special rapporteur called on the Bahraini government to "honour its commitments" and spoke of his "compassion with the people of Bahrain who were expecting my visit, and in particular, victims of torture and ill-treatment and their families".
The system was also implicated in a payment crisis which hit the Calcutta stock exchange in March, when a sharp fall in stock prices left a group of brokers with big carry forward positions unable to honour their financial commitments.
If Japan's workers cannot shoulder their burden, the country will find itself unable to honour fully its pension and health-care commitments.
"We think that it is important that Kazakhstan's government and citizens honour their international commitments and continue to strive for free and fair elections, " the Embassy said in a statement.
Paradoxically, the very size of the required subsidies may make firms reluctant to invest, says Peter Atherton, a utilities analyst at Citigroup, a big bank, out of fear that the government may not honour the commitments if voters start to complain.
ECONOMIST: Britain can have clean energy or cheap energy, but not both
Mr Obama also said he would honour the public commitments made by President George W Bush - who leaves office on 20 January - to support the US economy.
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